封装PHP增删改查方法

<?php


class sqlModel{

        public $db;

        public function __construct(){
            try{
                    $dbms='mysql';//数据库类型
                    $dbName='dbname';//使用的数据库
                    $user='root';//数据库连接用户名
                    $pwd='root';//数据库连接密码
                    $host='localhost';//数据库主机名
                    $port = '3306';//端口
                    $dsn = "mysql:host=$host;dbname=$dbName";
                    $this->db = new PDO($dsn,$user,$pwd);//数据库连接
                }catch(Exception $e){
                    die("Error!:".$e->getMessage().'<br>');
                }
        }

　　　　　//增加
        public function add($table,$str1,$str2){
            $sql = "insert into ".$table." set name=:xuesheng,age=:yuwen";                
            $db = $this->db;
            $db->query('set names utf8');
            $row = $db->prepare($sql);
            $res = $row->execute($str1);//数组的格式 $str1[':xuesheng']='xuesheng', $data[':yuwen'] = 'yuwen';
            return $row;
        }
    
　　　　　//删除
        public function del($table){
            $sql = "delete from ".$table.' where id = :id';
            $db = $this->db;
            $row = $db->prepare($sql);
            $res = $row->execute($str1);
            return $row;
        }
        
　　　　 //修改
        public function update($table,$str1){
            $sql = "UPDATE ".$table. " set name=:xuesheng,age=:yuwen where id = :id";
            $db = $this->db;
            $row = $db->prepare($sql);
            $res = $row->execute($str1);
            return $row;
        }
        
　　　　 //获取一条
        public function getOne($table,$id){
            $sql = "select * from ".$table;
            $db = $this->db;
            $data = $db->query($sql);
            $row = $data->fetch(PDO::FETCH_ASSOC);
            return $row;
        }
        
        //获取所有
        public function getAll($table){
            $sql = "select * from ".$table;
            $db = $this->db;
            $data = $db->query($sql);
            while($row = $data->fetch(PDO::FETCH_ASSOC)){
                $arr[] = $row;
            }
            return $arr;
        }
    
}

?>

调用方法：

<?php


require "demo.php";//把刚才的文件加载进来

$dbsql = new sqlModel();
$res = $dbsql->add('jh_ceshi',array(':xuesheng'=>'ceshi',':yuwen'=>213,':id'=>6,'');
$res = $dbsql->del('jh_ceshi',array(':id'=>6);
$res = $dbsql->update('jh_ceshi',array(':xuesheng'=>'ceshi',':yuwen'=>213,':id'=>6,'');
$res = $dbsql->getOne('jh_ceshi',6,'');
$res = $dbsql->getAll('jh_ceshi');

?>

写的不好，请大家赐教。

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